San Francisco 49ers quarterback Alex Smith (L) gets tackled by Denver Broncos D.J. Williams as Smith scrambled out of the pocket on a broken play during their NFL game in Denver, Colorado, December 31, 2006. REUTERS/Mark Leffingwell (UNITED STATES)

San Francisco 49ers quarterback Alex Smith (L) gets tackled by Denver Broncos D.J. Williams as Smith scrambled out of the pocket on a broken play during their NFL game in Denver, Colorado, December 31, 2006. REUTERS/Mark Leffingwell (UNITED STATES)